Sterile neutrinos and R_K

2013/02/22 by Avelino Vicente, Vicente, A.
Physics and Astronomy · #Particle physics theoretical and experimental studies #Neutrino Physics Research #Dark Matter and Cosmic Phenomena

paper · pdf · doi:10.48550/arxiv.1302.5539

Abstract

We study the violation of lepton flavour universality in light meson decays due to the presence of non-zero mixings between the active neutrinos with new sterile states. The modified W ℓ ν vertices, arising from a non-unitarity leptonic mixing matrix intervening in charged currents, might lead to a tree-level enhancement of R_P = Γ(P → e ν) / Γ(P → μν), with P=K, π. These enhancements are illustrated in the case of the inverse seesaw, showing that one can saturate the current experimental bounds on Δr_K (and Δr_π), while in agreement with the different experimental and observational constraints.

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